Mercruiser Mercarb or Rochester?

Mercruiser has used several different types of carburetors over the years.
The Rochester 2 Barrel Carb was popular on the early 4 cylinder models and it
was also used on a few V6 and V8/305 GM engines as well.

Rochester then stopped production so Mercury Marine designed its own version of the
Rochester 2 Barrel Carburetor called the Mercarb.

The Mercarb and Rochesters were mixed in production models.
When ordering replacement carbs, kits or parts you need to know exactly
which carb your engine has.

One simple test can distinguish between a Rochester and a Mercarb.
The throttle base plate of a Rochester Carb has two idle mixture screws.
The throttle base plate of a Mercarb has only one idle mixture screw.

If you have determined that your carb is a Mercarb, then there is one more
identification you need to make.
The Mercarb came with two different styles of accelerator pumps.
One pump rod was straight and cut off flat at the very top. This was the older style.
The other pump rod has a 90 deg bend at the top. This is the newer style.

Click HERE for a list of Remanufactured Carburetors.
Click HERE for a list of New Carburetors and Carburetor Rebuild Kits.

Safety
Boats can explode. Moving parts can rip your off your fingers.
Hot exhaust can burn you to the bone and props can slice you up.
One spark near a battery can cause an explosion.
You can never be too careful. Remove the battery from the boat before
working with fuel. Always disconnect the batteries negative terminal first.
Clean up any spilt fuel and let ALL of the fumes dissipate before installing
the battery and starting the motor. Pulleys and Belts can grab your clothes and hair.
Don't wear loose clothing and keep your hair up under a hat.
Always wear safety glasses.
Be smart.